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issue 8 - october 2007 1 www.zetex.com ? zetex semiconductors plc 2007 zxcl series micropower sc70-5 & sot23-5 low dropout regulators zxcl5213v25, zxcl5213v26, zxcl5213v28, zxcl5213v30, zxcl5213v33, zxcl250, zxcl260, zxcl280, zxcl300, zxcl330 description the zxcl series have been designed with space sensitive systems in mind. they are available in the ultra small sc70-5 package, which is half the size of sot23 based regulators. the devices can be used with all types of output capacitors including low esr ceramics and typical dropout voltage, is only 85mv at 50ma load. supply current is minimised with a ground pin current of only 50ma at full 150ma load. logic control allows the devices to be shut down, consuming typically less than 10na. these features make the device ideal for battery powered applications where power economy is critical. for applications requiring improved performance over alternative devices, the zxcl is also offered in the 5 pin sot23 package with an industry standard pinout. the devices feature thermal overload and over-current protection and are available with output voltages of 2.5v, 2.6v, 2.8v, 3v, 3.3v. package footprint sot23-5 (see p7 for sc70-5) package suffix - e5 features ? can be used with all types of output capacitor ? low 85mv dropout at 50ma load ? 50 m a ground pin current with full 150ma load ? 2.5, 2.6, 2.8, 3, & 3.3 volts output ? very low noise, without bypass capacitor ? thermal overload and over-current protection ? 5-pin sc70 and sot23 package ? no-load stable applications ? cellular and cordless phones ? pda ? hand held instruments ? camera, camcorder, personal stereo ? pcmcia cards ? portable and battery-powered equipment no-load stability , the zxcl device will maintain regulation and is stable with no external load. e.g. cmos ram appl acations. typical application circuit v in gnd en v o nc to p vi ew
zxcl series issue 8 - october 2007 2 www.zetex.com ? zetex semiconductors plc 2007 ordering information absolute maximum rating stresses beyond those listed under ?absolute maximu m ratings? may cause permanent damage to the device. these are stress ratings only, and f unctional operation of the device at these or any other conditions beyond those indicated in the oper ational sections of the specifications is not implied. exposure to absolute maximum conditions fo r extended periods may affect device reliability. order reference voltage (v) package part marking status reel size (inches) tape width (mm) quantity per reel zxcl250h5ta 2.5 sc70-5 l25a active 7 8 3000 zxcl260h5ta 2.6 sc70-5 l26a active 7 8 3000 zxcl280h5ta 2.8 sc70-5 l28a active 7 8 3000 zxcl300h5ta 3.0 sc70-5 l30a active 7 8 3000 zxcl330h5ta 3.3 sc70-5 l33a active 7 8 3000 zxcl400h5ta 4.0 sc70-5 l40a obsolete 7 8 3000 zxcl5213v25h5ta 2.5 sc70-5 l25c active 7 8 3000 zxcl5213v26h5ta 2.6 sc70-5 l26c active 7 8 3000 zxcl5213v28h5ta 2.8 sc70-5 l28c active 7 8 3000 ZXCL5213V30H5TA 3.0 sc70-5 l30c active 7 8 3000 zxcl5213v33h5ta 3.3 sc70-5 l33c active 7 8 3000 zxcl5213v40h5ta 4.0 sc70-5 l40c not rec. for new designs 7 8 3000 zxcl250e5ta 2.5 sot23-5 l25b active 7 8 3000 zxcl260e5ta 2.6 sot23-5 l26b active 7 8 3000 zxcl280e5ta 2.8 sot23-5 l28b active 7 8 3000 zxcl300e5ta 3.0 sot23-5 l30b active 7 8 3000 zxcl330e5ta 3.3 sot23-5 l33b active 7 8 3000 zxcl400e5ta 4.0 sot23-5 l40b obsolete 7 8 3000 terminal voltage with respect to gnd v in -0.3v to 7.0v e n -0.3v to 10v v o -0.3v to 5.5v package power dissipation (t a =25c) sc70-5 300mw (note 1) sot23-5 450mw (note 1) output short circuit duration infinite continuous power dissipation internally limited operating temperature range -40c to +85c storage temperature range -55c to +125c
zxcl series issue 8 - october 2007 3 www.zetex.com ? zetex semiconductors plc 2007 recommended operating conditions * output voltage will start to rise when v in exceeds a value or approximately 1.3v. for normal o peration, v in(min) > v out(nom) + 0.5v. pin description symbol parameter min max units v in input voltage range 2.0* 5.5 v v enh enable pin logic level high pin 2.2 10 v v enl enable pin logic level low pin 0 0.8 v t a ambient temperature range -40 85 c symbol parameter v in supply voltage g nd ground e n active high enable input. ttl/cmos logic compatible . connect to v in or logic high for normal operation n/c no connection v o regulator output
zxcl series issue 8 - october 2007 4 www.zetex.com ? zetex semiconductors plc 2007 electrical characteristics v in = v o = 0.5v, all values at t a = 25c (unless otherwise stated) device testing is performed at t a =25c. device thermal performance is guaranteed by d esign. note1: maximum power dissipation is calculated assu ming the device is mounted on a pcb measuring 2 inch es square note2:output voltage will start to rise when v in exceeds a value or approximately 1.3v. for normal o peration, v in(min) > v out(nom) + 0.5v. note3:dropout voltage is defined as the difference between v in and v o , when v o has dropped 100mv below its nominal value. nominal value of v o is defined at v in =v o +0.5v. symbol parameter conditions limits units min. typ. max. v o output voltage i o =1ma -2% +2% v i o =100ma v o +0.5v < v in < v in max -3% +3% v d v o / d t output voltage temperature coefficient -15 ppm/c i o(max) output current 150 ma xcl250/5213v25 only 100 i olim over current limit 160 800 ma xcl250/5213v25 only 105 230 750 i o ground pin current no load 25 50 m a i o =150ma 50 120 m a i o =100ma 40 100 m a v do dropout voltage note 3 i o =10ma all variants 15 mv i o =50ma 85 mv i o =100ma zxcl250 / 5213v25 163 325 mv i o =100ma zxcl260 / 5213v26 155 310 mv i o =100ma zxcl280 / 5213v28 140 280 mv i o =100ma zxcl300 / 5213v30 140 280 mv i o =100ma zxcl330 / 5213v33 140 280 mv i o =100ma zxcl400 / 5213v40 140 280 mv d v lnr line regulation v in =(v o +0.5v) to 5.5v, i o =1ma 0.02 0.1 %/v d v ldr load regulation i o =1ma to 100ma 0.01 0.04 %/ma e n output noise voltage f=10hz to 100khz, c o =10 m f 50 m v rms v enhs enable pin hysteresis 150 mv i en enable pin input current v en =5.5v 100 nv i osd shutdown supply current v en =0v 1 m a t sd thermal shutdown temperature 125 165 c
zxcl series issue 8 - october 2007 5 www.zetex.com ? zetex semiconductors plc 2007 typical characteristics (zxcl280 / 5213 shown) -50 -25 0 25 50 75 100 2.79 2.80 2.81 -50 -25 0 25 50 75 100 23.0 23.2 23.4 23.6 23.8 24.0 24.2 24.4 24.6 24.8 25.0 0 1 2 3 4 5 0 5 10 15 20 25 30 0 25 50 75 100 125 150 20 25 30 35 40 45 50 55 60 0 1 2 3 4 5 6 0 1 2 3 4 5 6 0 25 50 75 100 125 150 175 0.00 0.05 0.10 0.15 0.20 0.25 v in = 3.3v no load output voltage v temperature output voltage (v) temperature ( ?c) v in = 3.3v no load ground current v temperature ground current (a) temperature (?c) no load ground current v input voltage ground current (a) input voltage (v) v in = 3.3v v in = 5v ground current v load current ground current (a) load current (ma) v in i out = 100ma i out = 1ma input to output characteristics voltage (v) input voltage (v) dropout voltage v output current dropout voltage (v) output current (ma)
zxcl series issue 8 - october 2007 6 www.zetex.com ? zetex semiconductors plc 2007 typical characteristics 0.0 0.1 0.2 0.3 0.4 0.5 -4 -3 -2 -1 0 1 3 4 5 6 0 10 20 30 40 50 60 70 80 90 100 0 1 2 3 4 5 6 0.0 0.1 0.2 0.3 0.4 0.5 -4 -3 -2 -1 0 1 3 4 5 6 0.0 0.1 0.2 0.3 0.4 0.5 -100 -50 0 50 100 300 350 400 10 100 1k 10k 100k 1m 0.01 0.1 1 10 10 100 1k 10k 100k 1m 0 10 20 30 40 50 60 70 80 0 -20 20 10 -10 c out = 1 m f t r & t f = 2.5 m s line rejection i l = 100ma d v out (mv) v in (v) time (ms) v in = 5v i l = 1ma i l = 100ma enable v in = 3.3v i l = 1ma i l = 100ma c out = 1 m f start-up response voltage (v) time ( m s) c out = 1 m f t r & t f = 2.5 m s 0 d v out (mv) v in (v) -10 10 -20 20 line rejection i l = 1ma time (ms) 100 50 c out = 10 m f c out = 1 m f c out = 10 m f c out = 1 m f v in = 5v i l = 1ma to 50ma 0 load response d v out (mv) i l (ma) time (ms) i l = 100ma, c out = 1 m f i l = 100ma, c out = 10 m f no load, c out = 10 m f no load, c out = 1 m f output noise v frequency noise m v/ ? hz frequency (hz) all caps ceramic surface mount i l = 50ma c out = 1 m f c out = 2.2 m f c out = 10 m f power supply rejection v frequency power supply rejection (db) frequency (hz)
zxcl series issue 8 - october 2007 7 www.zetex.com ? zetex semiconductors plc 2007 connection diagrams sc70-5 (h5) sc70-5 (h5) zxclxxx zxcl5213vxx schematic diagram v in gnd en v o nc to p vi ew e n n/c* g nd v in v o to p vi ew * should be left open circuit or connected to pin 3
zxcl series issue 8 - october 2007 8 www.zetex.com ? zetex semiconductors plc 2007 scheme to boost output current to 2a input to output diode in common with many other ldo regulators, the zxcl device has an inherent diode associated with the output series pass transistor. this diode has its anode connected to the output and its cathode to the input. the internal diode is normally reverse biased, but will conduct if the output is forced above the input by more than a vbe (approximately 0.6v). current will then flow from v out to v in . for safe operation, the maximum current in this diode should be limited to 5ma continuous and 30ma peak. an external schottky diode may be used to provide protection when this condition cannot be satisfied. increased output current any zxcl series device may be used in conjunction with an external pnp transistor to boost the output current capability. in the application circuit shown below, a fmmt717 device is employed as the external pass element. this sot23 device can supply up to 2.5a maximum current subject to the thermal dissipation limits of the package (625mw). alternative devices may be used to supply higher levels of current. note that with this arrangement, the dropout voltage will be increased by the v be drop of the external device. also, care should be taken to protect the pass transistor in the event of excessive output current.
zxcl series issue 8 - october 2007 9 www.zetex.com ? zetex semiconductors plc 2007 applications information enable control a ttl compatible input is provided to allow the regulator to be shut down. a low voltage on the enable pin puts the device into shutdown mode. in this mode the regulator circuit is switched off and the quiescent current reduces to virtually zero (typically less than 10na) for input voltages above the minimum operating threshold of the device. a high voltage on the enable pin ensures normal operation. the enable pin can be connected to v in or driven from an independent source of up to 10v maximum. (e.g. cmos logic) for normal operation. there is no clamp diode from the enable pin to v in , so the v in pin may be at any voltage within its operating range irrespective of the voltage on the enable pin. however input voltage rise time should be kept below 5ms to ensure consistent start-up response. current limit the zxcl devices include a current limit circuit which restricts the maximum output current flow to typically 230ma. practically the range of over-current should be considered as minimum 160ma to maximum 800ma. the device?s robust design means that an output short circuit to any voltage between ground and v out can be tolerated for an indefinite period. thermal overload thermal overload protection is included on chip. when the device junction temperature exceeds a minimum 125c the device will shut down. the sense circuit will re-activate the output as the device cools. it will then cycle unti l the overload is removed. the thermal overload protection will be activated when high load currents or high input to output voltage differentials cause excess dissipation in the device. start up delay a small amount of hysteresis is provided on the enable pin to ensure clean switching. this feature can be used to introduce a start up delay if required. addition of a simple rc network on the enable pin provides this function. the following diagram illustrates this circuit connection. the equation provided enables calculation of the delay period. figure 1 circuit connection figure 2 start up delay (t d ) r c t d t = rci n v v 1.5 d(nom ) in in ? ?? ? ?? ? c alc ulation of st art u p d elay as ab ove
zxcl series issue 8 - october 2007 10 www.zetex.com ? zetex semiconductors plc 2007 applications information (cont) power dissipation the maximum allowable power dissipation of the device for normal operation (p max ), is a function of the package junction to ambient thermal resistance ( q ja ), maximum junction temperature (tj max ), and ambient temperature (t amb ), according to the expression: p max = (tj max ? t amb ) / q ja the maximum output current (i max ) at a given value of input voltage (v in ) and output voltage (v out ) is then given by i max = p max / (v in - v out ) the value of qja is strongly dependent upon the type of pc board used. using the sc70 package it will range from approximately 280c/w for a multi-layer board to around 450c/w for a single sided board. it will range from 180c/w to 300c/w for the sot23-5 package. to avoid entering the thermal shutdo wn state, tjmax should be assumed to be 125c and imax less than the over-current limit,(i olim ). power derating for the sc70 and sot23-5 packages is shown in the following graph. capacitor selection and regulator stability the device is designed to operate with all types of output capacitor, including tantalum and low esr ceramic. for stability over the full operating range from no load to maximum load, an output capacitor with a minimum value of 1 m f is recommended, although this can be increased without limit to improve load transient performance. higher values of output capacitor will also reduce output noise. capacitors with esr less than 0.5v are recommended for best results. the dielectric of the ceramic capacitance is an important consideration for the zxcl series operation over temperature. zetex recommends minimum dielectric specification of x7r for the input and output capacitors. for example a ceramic capacitor with x7r dielectric will lose 20% of its capacitance over a -40 8 c to 85 8 c temperature range, whereas a capacitor with a y5v dielectric loses 80% of its capacitance at -40 8 c and 75% at 85 8 c. an input capacitor of 1 m f (ceramic or tantalum) is recommended to filter supply noise at the device input and will improve ripple rejection. the input and output capacitors should be positioned close to the device, and a ground plane board layout should be used to minimise the effects of parasitic track resistance. dropout voltage the output pass transistor is a large pmos device, which acts like a resistor when the regulator enter s the dropout region. the dropout voltage is therefore proportional to output current as shown in the typical characteristics. ground current the use of a pmos device ensures a low value of ground current under all conditions including dropout, start-up and maximum load. power supply rejection and load transient response line and load transient response graphs are shown in the typical characteristics. these show both the dc and dynamic shift in the output voltage with step changes of input voltage and load current, and how this is affected by the output capacitor. if improved transient response is required, then an output capacitor with lower esr value should be used. larger capacitors will reduce over/ undershoot, but will increase the settling time. best results are obtained using a ground plane layout to minimise board parasitics. -4 0- 20 02 04 06 08 0 100 0 100 200 300 400 500 so t2 3 sc7 0 derating cur ve max pow er di ssipatio n( mw ) t empe rat ure ( c)
zxcl series issue 8 - october 2007 11 www.zetex.com ? zetex semiconductors plc 2007 s70-5 package outline note: controlling dimensions are in millimeters. approxim ate dimensions are provided in inches dim. millimeters inches dim. millimeters inches min. max. min. max. min. max. max. max. a 0.80 1.10 0.0315 0.0433 e 2.10 bsc 0.0826 bsc a1 - 0.10 - 0.0039 e1 1.25 bsc 0.0492 bsc a2 0.80 1.00 0.0315 0.0039 e 0.65 bsc 0.0255 bsc b 0.15 0.30 0.006 0.0118 e1 1.30 bsc 0.0511 bsc c 0.08 0.25 0.0031 0.0098 l 0.26 0.46 0.010 0.018 d 2.00 bsc 0.0787 bsc a 0 8 0 8 a
zxcl series issue 8 - october 2007 12 www.zetex.com ? zetex semiconductors plc 2007 sot23-5 package outline note: controlling dimensions are in millimeters. approxim ate dimensions are provided in inches dim millimeters inches min. max. min. max. a 0.90 1.45 0.0354 0.0570 a1 0.00 0.15 0.00 0.0059 a2 0.90 1.30 0.0354 0.0511 b 0.20 0.50 0.0078 0.0196 c 0.09 0.26 0.0035 0.0102 d 2.70 3.10 0.1062 0.1220 e 2.20 3.20 0.0866 0.1181 e1 1.30 1.80 0.0511 0.0708 e 0.95 ref 0.0374 ref e1 1.90 ref 0.0748 ref l 0.10 0.60 0.0039 0.0236 a 0 30 0 30
zxcl series issue 8 - october 2007 13 www.zetex.com ? zetex semiconductors plc 2007 intentionally left blank
zxcl series issue 8 - october 2007 14 www.zetex.com ? zetex semiconductors plc 2007 zetex sales offices europe zetex gmbh kustermann-park balanstra?e 59 d-81541 mnchen germany telefon: (49) 89 45 49 49 0 fax: (49) 89 45 49 49 49 europe.sales@zetex.com americas zetex inc 700 veterans memorial highway hauppauge, ny 11788 usa telephone: (1) 631 360 2222 fax: (1) 631 360 8222 usa.sales@zetex.com asia pacific zetex (asia ltd) 3701-04 metroplaza tower 1 hing fong road, kwai fong hong kong telephone: (852) 26100 611 fax: (852) 24250 494 asia.sales@zetex.com corporate headquarters zetex semiconductors plc zetex technology park, chadderton oldham, ol9 9ll united kingdom telephone: (44) 161 622 4444 fax: (44) 161 622 4446 hq@zetex.com ? 2007 published by zetex semiconductors plc definitions product change zetex semiconductors reserves the right to alter, w ithout notice, specifications, design, price or con ditions of supply of any product or service. customers are solely responsible for obtai ning the latest relevant information before placing orders. applications disclaimer the circuits in this design/application note are of fered as design ideas. it is the responsibility of the user to ensure that the circuit is fit for the user?s application and meets with the user?s re quirements. no representation or warranty is given and no liability whatsoever is assumed by zetex with respect to the accuracy or us e of such information, or infringement of patents o r other intellectual property rights arising from such use or otherwise. zetex does not assume any legal responsibility or will not be held legally liable (whether in contract, tort (including negligence), breach of statutory du ty, restriction or otherwise) for any damages, loss of profit, business, contract, opportunity or consequential loss in the use of the se circuit applications, under any circumstances. life support zetex products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of zetex se miconductors plc. as used herein: a. life support devices or systems are devices or s ystems which: 1. are intended to implant into the body or 2. support or sustain life and whose failure to perf orm when properly used in accordance with instructi ons for use provided in the labelling can be reasonably expected to result in s ignificant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform c an be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. reproduction the product specifications contained in this public ation are issued to provide outline information onl y which (unless agreed by the company in writing) may not be used, applied or rep roduced for any purpose or form part of any order o r contract or be regarded as a representation relating to the products or services concerned. terms and conditions all products are sold subjects to zetex? terms and conditions of sale, and this disclaimer (save in th e event of a conflict between the two when the terms of the contract shall prevail) accor ding to region, supplied at the time of order ackno wledgement. for the latest information on technology, delivery terms and conditions and prices, please contact you r nearest zetex sales office. quality of product zetex is an iso 9001 and ts16949 certified semicond uctor manufacturer. to ensure quality of service and products we strong ly advise the purchase of parts directly from zetex semiconductors or one of our regionally authorized distributors. for a complete listing of authorized distributors please visit: www.zetex.com/salesnetwork zetex semiconductors does not warrant or accept any liability whatsoever in respect of any parts purch ased through unauthorized sales channels. esd (electrostatic discharge) semiconductor devices are susceptible to damage by esd. suitable precautions should be taken when hand ling and transporting devices. the possible damage to devices depends on the circu mstances of the handling and transporting, and the nature of the device. the extent of damage can vary from immediate functional or par ametric malfunction to degradation of function or p erformance in use over time. devices suspected of being affected should be repla ced. green compliance zetex semiconductors is committed to environmental excellence in all aspects of its operations which includes meeting or exceeding regulatory requirements with respect to the use of hazardous substances. numerous successful programs have been implemented to reduce the use of hazardous substances and/or emiss ions. all zetex components are compliant with the rohs di rective, and through this it is supporting its cust omers in their compliance with weee and elv directives. product status key: ?preview? future device intended for production at s ome point. samples may be available ?active? product status recommended for new designs ?last time buy (ltb)? device will be discontinued an d last time buy period and delivery is in effect ?not recommended for new designs? device is still in production to support existing d esigns and production ?obsolete? production has been discontinued datasheet status key: ?draft version? this term denotes a very early datas heet version and contains highly provisional inform ation, which may change in any manner without notice. ?provisional version? this term denotes a pre-releas e datasheet. it provides a clear indication of anti cipated performance. however, changes to the test conditions and specifi cations may occur, at any time and without notice. ?issue? this term denotes an issued datasheet contai ning finalized specifications. however, changes to specifications may occur, at any time and without n otice.

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